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- 6 - <br />varies from 16 to 51 feet thick, depending on the location of the <br />• boring. In general, the thickness increases toward the south of the <br />valley. The refuse material oorasists of shale, siltstone, sandstone, <br />and coal sediments. The soil borings penetrated layers of cohesive <br />sandy clays, 1 to 3 feet thick, interbedded between the refuse <br />material. Underlying the refuse material is a layer of medium stiff to <br />stiff natural overburden clays approximately 5-feet thick. The clay <br />overlies a medium hard to hard claystone-sandstone bedrock. GYapbic <br />logs of the test borings are shown on Figures. 3, 4 and 5. Tables I <br />through III summarizes the results of laboratory testing, Table N <br />presents the results of the field percolation tests. <br />The field investigation program consisted of standard penetration <br />tests for disturbed samples. Undisturbed sartples were obtained by <br />• means of thin walled Shelb~+ tubes and California samples. Due to <br />rarxbmly scattered large pieces of the refuse, the Shelby tube samples <br />generally did not produce truly undisturbed sales. However, <br />relatively undisturbed samples were obtained from California liners <br />and tested in the laboratory. Undisturbed sales were also obtained <br />from the inert layers and fram the overburden soils. In addition to <br />soil borings, three in-situ pressuremeter tests were conducted in the <br />refuse pile. The results of these tests are shown on Figures. 6 <br />through B. ~e pressuremeter tests were perfoaaed to correlate the <br />in~plaoe properties of the refuse with the laboratory test data. <br />Percolation tests ware also conducted to determine flow rates in the <br />refuse material. The results of the percolation tests are shown on <br />Table N. <br /> <br />